1 files changed, 6 insertions, 1 deletions
diff --git a/tests/util.scm b/tests/util.scm
index 33ebdcf6..6ad58a24 100644
--- a/tests/util.scm
+++ b/tests/util.scm
@@ -1,5 +1,10 @@
-(((util) filter-sorted))
+(((util) filter-sorted set/r!))
 
 (test-equal "Filter sorted"
   '(3 4 5)
   (filter-sorted (lambda (x) (<= 3 x 5)) (iota 10)))
+
+(test-equal "set/r! single"
+  #f
+  (let ((x #t))
+    (set/r! x = not)))